Alexander White: It's hard to pin down exactly what prime minister Tony Abbott really believes on climate change, but his policies could only have been developed by someone who believes global warming is a hoax.

Alexander White: Ignoring climate change, the biggest threat facing the world, is simply not a moral option for Tony Abbott, Australia or the G20. It would be a huge mistake for the prime minister to make.

Alexander White: Instead of cutting public funding for climate initiatives, Tony Abbott and the Australian government could save $2.4 billion next year by scrapping the diesel fuel subsidy. So why won't he?